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Karnataka PUC II Moving Charges and Magnetism — practice questions — page 2

Explore 193 free Moving Charges and Magnetism questions in Karnataka PUC II Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Moving Charges and Magnetism questions and exercises with answers

Showing questions 31–60 of 193.

The period of revolution of a charged particle moving in a uniform magnetic field perpendicular to its velocity isRead the answer and worked solution →A 0.5 m wire carrying 2 A is placed perpendicular to a 0.4 T magnetic field. The force on the wire isRead the answer and worked solution →Two long parallel wires 0.1 m apart carry 5 A and 10 A in the same direction. The force per unit length on each wire isRead the answer and worked solution →At equilibrium, the deflection ϕ of a moving coil galvanometer with N turns, area A, current I, in a radial magnetic field B and spring constant k satisfiesRead the answer and worked solution →An electron enters a uniform magnetic field B at angle θ to B with speed v. The pitch of its helical path isRead the answer and worked solution →A cyclotron of dee radius R accelerates ions of charge q, mass m in a magnetic field B. The maximum kinetic energy isRead the answer and worked solution →A circular loop of radius R carries current I. The magnetic field at a point on its axis at distance x from the centre isRead the answer and worked solution →At the very end of a long solenoid, the magnetic field along the axis isRead the answer and worked solution →A magnetic dipole with moment m makes angle θ with a uniform field B. The torque on the dipole has magnitudeRead the answer and worked solution →An electron moves east in a magnetic field directed north. The magnetic force on the electron pointsRead the answer and worked solution →A cyclotron operates at frequency f in a magnetic field B. The charge-to-mass ratio of the accelerated ion isRead the answer and worked solution →The current sensitivity of a moving coil galvanometer with N turns, coil area A, magnetic field B, spring constant k isRead the answer and worked solution →A 0.1 m radius loop carries 5 A. The magnetic field at a point on its axis 0.1 m from the centre is approximately (μ₀ = 4π × 10⁻⁷ T·m/A)Read the answer and worked solution →A bar magnet with N pole pointing right is placed near a circular current loop whose magnetic moment also points right. The interaction isRead the answer and worked solution →Cyclotrons are not used to accelerate electrons becauseRead the answer and worked solution →A long solenoid has 1000 turns per metre and carries 2 A. The magnetic field strength inside isRead the answer and worked solution →A square coil of side 0.1 m, with 50 turns, carries 1 A in a 0.2 T field. The maximum torque on the coil isRead the answer and worked solution →A charge q moves with velocity v through a region with electric field E and magnetic field B. The net electromagnetic force on it isRead the answer and worked solution →Match each current to its fieldRead the answer and worked solution →Judge these claims on magnetic forceRead the answer and worked solution →The Lorentz forceRead the answer and worked solution →Work done by a magnetic forceRead the answer and worked solution →Reading the Lorentz forceRead the answer and worked solution →Force on a current wireRead the answer and worked solution →The current carrying conductorRead the answer and worked solution →Charge in a uniform fieldRead the answer and worked solution →What the cyclotron frequency ignoresRead the answer and worked solution →The cyclotron machineRead the answer and worked solution →Formula to what it describesRead the answer and worked solution →The Biot-Savart lawRead the answer and worked solution →

Worked practice questions

The period of revolution of a charged particle moving in a uniform magnetic field perpendicular to its velocity is

  1. 2πqB/m
  2. qB/(2πm)
  3. m/(2πqB)
  4. 2πm/(qB)
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Correct answer: D. 2πm/(qB)

1. Magnetic force provides centripetal force: qvB = mv²/r. 2. Orbital speed v = qBr/m, so angular velocity ω = v/r = qB/m. 3. Period T = 2π/ω = 2πm/(qB). 4. Notice T is independent of v and r, so the cyclotron frequency stays constant as the particle gains energy. _Source: syllabus Physics Ch 4 "Moving Charges and Magnetism", §4.3_

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A 0.5 m wire carrying 2 A is placed perpendicular to a 0.4 T magnetic field. The force on the wire is

  1. 0.2 N
  2. 0.4 N
  3. 2.5 N
  4. 4.0 N
Show answer and solution

Correct answer: B. 0.4 N

1. The force on a current-carrying wire in a perpendicular field is F = BIL. 2. Given B = 0.4 T, I = 2 A, L = 0.5 m. 3. Substitute: F = 0.4 × 2 × 0.5. 4. F = 0.4 N. So option B. _Source: syllabus Physics Ch 4 "Moving Charges and Magnetism", §4.2.3_

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Two long parallel wires 0.1 m apart carry 5 A and 10 A in the same direction. The force per unit length on each wire is

  1. 10⁻⁵ N/m
  2. 10⁻⁴ N/m
  3. 2 × 10⁻⁴ N/m
  4. 10⁻³ N/m
Show answer and solution

Correct answer: B. 10⁻⁴ N/m

1. The force per length between parallel currents is F/L = μ₀I₁I₂/(2πd). 2. Plug in: μ₀/(2π) = 2 × 10⁻⁷ T·m/A. 3. F/L = 2 × 10⁻⁷ × 5 × 10 / 0.1. 4. F/L = 10⁻⁴ N/m (attractive, since the currents are parallel). _Source: syllabus Physics Ch 4 "Moving Charges and Magnetism", §4.9_

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